14. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE ATV 50 Inspection Check the piston for scratches or wear. Measure the piston O.D. with a micrometer gauge. Service limit: 33.85 mm (1.354 in) replace if below Check the caliper cylinder for scratches or wear and measure the caliper cylinder I.D. Service limit: 34.05 mm (1.362 in) replace if over Assembly Clean all removed parts. Apply silicon grease to the pistons and oil seals. Lubricate the brake caliper cylinder inside wall with brake fluid. Install the oil seals and then install the brake caliper pistons with the grooved side facing out. Install the piston with its outer end protruding 35 mm (0.120.2 in) beyond the brake caliper. Wipe off excessive brake fluid with a clean shop towel. Apply silicon grease to the brake caliper holder pin and caliper inside. Install the brake caliper holder. 14-24